COMMUNITY FORUM

underlayment for roofing

I have a question about the peel-and-stick product. I understand that the plusses for this material are that it is much stronger than felt and that it seals around any screws or nails. But I understand that it has two drawbacks. Number one is that it is hard to trace any leaks, and number two is that it is difficult to remove if you have to re-roof again. Is this true, and are there any other pros and cons to this material? Would it be better to use the new titanium underlayment under metal, instead of the peel-and-stick?